Soil organic carbon and nitrogen stocks in an age-sequence of poplar stands planted on marginal agricultural land in Northeast China
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Afforestation of marginal agricultural land has been considered to be an effective measure to sequester atmospheric CO2. In this study, we adopted the volume- and mass-based methods to investigate the changes in soil organic C and total N stocks in 100 cm depth following afforestation of marginal agricultural land using a chronosequence of poplar (Populus euramericana cv. “N3016”) stands in a semiarid region of Liaoning Province, Northeast China. Our results showed that soil organic C and total N concentrations in 45–60 cm layer increased gradually following afforestation of agricultural land, whereas in 60–100 cm layer, they declined initially, and then increased with stand development. Based on volume- and mass-based methods, such land-use change caused initial declines in soil organic C and total N stocks, and then increases between the stand ages of 10 and 20. Forest soils recovered to the initial soil organic C and N stocks found in agricultural land at age 15. However, the volume-based method would underestimate the absolute organic C and N stocks compared with the mass-based methods. Our results suggest that afforestation of marginal agricultural land has the potential to sequester atmospheric CO2 in soils in semiarid regions. Stand age, soil sampling depth and the methods used to quantify organic C and N stocks should be considered for accurate assessments of changes in soil organic C and N stocks.
KeywordsAfforestation of agricultural land Carbon sequestration Chronosequence Land use change Nitrogen sequestration
This work was funded by the National Key Technologies R&D Program of China (No. 2006BAD03A0502) and the National Natural Science Foundation of China (No. 30872011). We thank two anonymous reviewers and Fu-Sheng Chen for their helpful remarks on an earlier version of this manuscript. We also thank He-Ming Lin, Gui-Yan Ai and Jing-Shi Li for laboratory analyses, and other colleagues who participated in the field work.
- Bai X, Hu Y, Zeng D, Jiang Z (2008) Effects of farmland afforestation on ecosystem carbon stock and its distribution pattern in semi-arid region of Northwest China. Chin J Ecol 27:1647–1652 (in Chinese)Google Scholar
- Binkley D, Resh SC (1999) Rapid changes in soils following eucalyptus afforestation in Hawaii. Soil Sci Soc Am J 63:222–225Google Scholar
- Ellert BH, Bettany JR (1995) Calculation of organic matter and nutrients stored in soils under contrasting management regimes. Can J Soil Sci 75:529–538Google Scholar
- FAO (2006) World reference base for soil resources 2006. World soil resources reports No. 103. FAO, RomeGoogle Scholar
- Graham RC, Wood HB (1991) Morphologic development and clay redistribution in lysimeter soils under chaparral and pine. Soil Sci Soc Ame J 55:548–551Google Scholar
- Hu YL, Zeng DH, Jiang T (2009) Effects of afforested poplar plantations on the stock and distribution of C, N, P at Keerqin Sandy Lands. Acta Ecologica Sinica 29:4206–4214, in ChineseGoogle Scholar
- IPCC (2000) Land use, Land-use change, and forestry. Cambridge University Press, CambridgeGoogle Scholar
- Kimmins JP (2004) Forest ecology—a foundation for sustainable forest management and environmental ethics in forestry, 3rd edn. Prentice Hall, NJ, pp 49–55Google Scholar
- Nelson DW, Sommers LE (1996) Total carbon, organic carbon and organic matter. In: Sparks DL (Ed.) Methods of soil analysis. Part 3. Chemical Methods. Wisconsin, USA, pp 961–1010Google Scholar
- Romanya J, Cortina J, Falloon P, Coleman K, Smith P (2000) Modelling changes in soil organic matter after planting fast-growing Pinus radiata on Mediterranean agricultural soils. Eur J Soil Sci 51:627–641Google Scholar
- VandenBygaart AJ, Angers DA (2006) Towards accurate measurements of soil organic carbon stock change in agroecosystems. Can J Soil Sci 86:465–471Google Scholar